Three-pipe type heat recovery multi-split air conditioning unit and control method thereof

• Main Authors: ZHANG XINPEI, LUO JIANWEN, LI XU, CHEN HONGYAO
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2023
• Subjects: AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

The invention belongs to the technical field of air conditioners, and particularly provides a three-pipe type heat recovery multi-split air conditioning unit and a control method thereof. The problem that noise generated in the opening process of an electronic expansion valve of an indoor unit of an existing three-pipe type heat recovery multi-split air conditioning unit and a control method of the existing three-pipe type heat recovery multi-split air conditioning unit is too large is solved. Therefore, the three-pipe type heat recovery multi-split air conditioning unit comprises a plurality of indoor units arranged in parallel and a valve box connected with the indoor units, and an electronic expansion valve is arranged in the valve box. The electronic expansion valve is controlled to be opened to the preset opening degree in an intermittent opening degree increasing mode; and when the opening degree of the electronic expansion valve reaches the preset opening degree, the electronic expansion valve is contr